Dr. Deborah Nucatola, the senior director of medical services at Planned Parenthood, appears to discuss the popularity of fetus limbs and livers in an undercover video released by an anti-abortion group. The footage was altered, an analysis has found. (The Center for Medical Progress via YouTube)

A series of undercover videos purportedly showing Planned Parenthood employees negotiating the price of fetal tissue were altered, according to an analysis the embattled group commissioned.

Planned Parenthood on Thursday provided congressional leaders findings from a private research company that asserts the so-called secretly recorded footage was manipulated and can't be used as evidence.

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"A thorough review of these videos in consultation with qualified experts found that they do not present a complete or accurate record of the events they purport to depict," the 10-page analysis said.

Planned Parenthood came under fire last month after anti-abortion activists released a video appearing to show a Planned Parenthood doctor discussing fetus body parts for sale with undercover abortion opponent posing as a buyer.

The highly-edited, 9-minute video of the purported July 2014 lunch meeting in Los Angeles was produced by the Center for Medical Progress.

The anti-abortion group called on supporters to hold Planned Parenthood accountable.

The footage caused a firestorm of controversy and led Congressional Republicans to launch an investigation.

A vote is likely in the fall on whether to defund the group, which receives $500 million in funding.

Brandi Jensen (c.) shares her opinions with an anti-Planned Parenthood protester as Planned Parenthood Action Council holds a community rally at the state Capitol, Tuesday, Aug. 25, 2015, in Salt Lake City. (Leah Hogsten/AP)

Planned Parenthood has denied the validity of the videos, saying they were "heavily edited" and falsely portrays the health care group's work.

Statements were spliced together at least 42 times to appear like seamless conversations, the analysis found. Two of the videos were each missing 30-minute chunks of footage.

CMP's "undisclosed edits and cuts distort the meaning of the encounters the videos purport to document," the analysis said.

It was conducted by Fusion GPS, a Washington-based research and corporate intelligence company, and its co-founder Glenn Simpson, a former investigative reporter for The Wall Street Journal, according to The New York Times.

"Our commitment is to get all the facts and share them fully, and that's what we're doing today," Planned Parenthood President Cecile Richards said. "The more the public learns about this fraudulent, baseless attack on women's health, the better, and that's why today we're laying everything out for leaders in Congress and for the public."

CMP called the analysis a "complete failure" and Planned Parenthood's "desperate, 11th-hour attempt" to clear its name.

"The absence of bathroom breaks and waiting periods between meetings does not change the hours of dialogue with top-level Planned Parenthood executives eager to manipulate abortion procedures to get high-quality baby parts for financially profitable sale," the group said in a statement.